Saw set



April ,1 J. A. JOHNSON 2,155,901

"SAW SET Filed June 27, 1938 3 Sheets-Sheet l Jdmd'fl @kizuvm INVENT'OR.

ATTORNEYS.

April 25, 1939. I J. A. JOHNSQILV SAW SET Filed Jun 27, 1938 s Sheets-Sheet 3 JZmes A zfakmyarz/ N V EN TOR.

A TTORNEYS.

Patented Apr. 25, 1939 UNITED STATES SAW SET James A. Johnson, Lexington, N. 0., assignor of one-half to Benjamin F. Green, Sr., Lexington, N. C.

Application June 27, 1938, Serial No. 216,149

4 Claims. (01. ve -62) The objects of the invention are to provide a saw set which will operate on the teeth of buzz saws or cross cut saws, to provide novel means for operating the trip hammer, to provide novel means for regulating the force of the blow imparted by the trip hammer, and to provide novel means for positioning the saw properly with respect to the trip hammer and the anvil.

It is within the province of the disclosure to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may 20 be made within the scope of what is claimed,

without departing from the spirit of the invention.

In the drawings:

Fig. 1 shows in vertical section, a saw set constructed in accordance with the invention, parts being broken away and most parts appearing in elevation;

Fig. 2 is a top plan;

Fig. 3 is a horizontal section showing the guide in top plan;

Fig. 4 is a vertical section showing the trip hammer, the anvil and associated parts, most portions appearing in elevation, the trip hammer being in the position which it will assume before the operation of the machine is begun;

Fig. 5 is a view showing sundry parts as they will appear at an intermediate step in the operation;

Fig. 6 is a view similar to Fig. 5, but showing the parts as they will appear when set for an earlier kick-off than in Fig. 5;

Fig. 7 is a sectional view showing the holder for a buzz saw.

In carrying out the invention, there is provided a frame F including a stand I to one side portion of which is fixed an outstanding hook shaped guide 2 (Figs. 1 and 3). A vertical anvil holder 3 (Figs. 1 and 4) is secured at 8 to the upper end of the stand I. The numeral 4 marks an anvil having a reduced lower end held against rotation in the anvil holder 3. At its upper end, the anvil 4 is supplied with a downwardly and outwardly inclined surface 5.

The numeral 5 (Figs. 2 and 1) marks a horizontal triangular head. The apex of the head 6 is secured to the anvil holder 3. Near to its base, the head 6 is connected by brackets 9 to the upper end of the stand I. An arcuate slotted guide III is supplied and is joined by connections II to the base of the triangular head B.

The numeral 1 marks an upwardly inclined, two part arm secured at its inner end to the anvil holder 3. The arm I is sustained from the anvil holder 3 by braces I2. The outer ends of the braces I2 are attached to the arm I by a securing element I4.

A trip hammer is provided and includes a lever I5 fulcrumed intermediate its ends at I6 on the arm I. The upper end of a pull spring I1 is connected to the lever I5, near to the inner end of the lever, the lower end of the pull spring being attache-d to the securing element I4 that connects the braces I2 to the arm I. A transverse head I8 is secured to the inner end of the lever I5 and has a socket wherein is held, against rotation, the reduced end of a peen I9 adapted to cooperate with the inclined end surface 5 of the anvil 4.

An actuator 20, preferably a pedal, is fulcrumed at 2| on the lower portion of the stand I. The lower end of an operating member or pitman 22 is pivoted at 23 to the actuator or pedal 20. The operating member 22 can swing in the hook-shaped guide 2, as Figs. 1 and 3 will indicate. The lower end of a pull'spring 24 is connected to the intermediate portion of the operating member 22, the upper end of the pull spring being connected to the rigid arm I of the stand I. The pull spring 24 is inclined with respect to the vertical, and has a tendency to swing the operating member 22 in the direction of the arrow A in Figs. 1, 4, 5 and 6. Near to its upper end, the operating member 22 has a transverse shoulder 25, terminating in an upstanding finger 26. The shoulder 25 is adapted to coop-- erate with a keeper 2'! in the form of a clamp bolt mounted in the hammer lever I5, near to the outer end of the hammer lever. The clamp bolt 21 holds on the lever I5, a U-shaped throw-off 28, the side arms of the throw-oil. having elongated slots for the reception of the clamp bolt.

The means for supporting the saw to be set includes a pair of angle brackets 29 located on opposite sides of the anvil holder 3, and connected to the upper part of the stand I by clamp bolts 30, the construction being such that the angle brackets 29 may be swung in and out (Fig. 2) for adjustment, to dispose their vertical portions more or less widely apart, thereby increasing or diminishing the Width of the support that is given to the saw.

An angle bracket 3I (Fig. 4) is secured to the anvil holder 3. The inner end of a radius arm 32 is connected to the angle bracket 3I by a combined clamping and pivot bolt 33. The inner end of the radius arm 32 has a plurality of openings 34 (Fig. 2) adapted for the reception of the bolt 33, and providing for adjustment. The outer portion of the radius arm 32 moves horizontally in the slot of the fixed arcuate guide I0. By loosening the clamping and pivot bolt 33, the radius arm 32 can be adjusted horizontally, but by setting up on the bolt 33, the radius arm will be held in any position to which it may have been adjusted. The radius arm 32 has an elongated slot or guide 35 (Fig. 2). In the slot 35, a threaded standard 36 is held, by nuts 31, for adjustment lengthwise of the radius arm 32. A frusto-conical saw holder 38 is threaded on the standard 36 for vertical adjustment. A single saw holder, only, is shown, but it will be understood that the said saw holder may be replaced by another, having more or less conical slant, depending upon the size of the hole in the buzz saw to be set, and upon other conditions which will suggest themselves readily to the user.

If an ordinary cross cut saw is to be set, the cross cut saw is supported on the angle brackets 29, and on the upper end of the anvil 4, the tooth which is to be set being disposed abcve the incline surface 5 of the anvil 6. If a buzz saw is to be set, the hole in the buzz saw receives the saw holder 38, the buzz saw being supported, if desired, on the angle brackets 29 and on the anvil 4. the tooth to be set cooperating with the inclined surface 5 of the anvil 4. In order to adjust the machine to buzz saws of different diameters, the standard 36, carrying the saw holder 38, may be adjusted lengthwise of the radius arm 32, in the slot 35 of the radius arm, the nuts 31 being tightened up, when the desired adjustment has been procured. The clamping and pivot bolt 33 can be loosened, and the radius arm 32 may be swunghorizontally, and then the bolt 33 may be set up to hold the radius arm 32 fixed. By this adjustment, the teeth of the saw which are to be set are shifted with respect to the inclined surface 5 of the anvil 4 and with respect to the cooperating part of the hammer peen i9.

Starting out with the parts in the position of Fig. 4, and referring to Fig. 1, the operator presses down on the pedal 2!}, elongating the spring 24 and moving the pitman 22 downwardly. As the pitman 22 moves downwardly to the position of Fig; 5, the shoulder 25 on the pitman engages the keeper 2? in the outer end of the hammer lever 55, the inner edge of the finger 26 of the pitman being in engagement with the upper part of the throw-off 28; The lever 15 thus is tilted upwardly at its inner end, on the lever fulcrum l6, and the hammer peen i9, is raised with respect to the anvil 4, the spring l'l being elongated. As the outer end of the hammer lever l5 moves downwardly, the throw-off 28 swings the operating member or pitman 22 to the left. A time arrives when the shoulder 25 of the pitman 22 is entirely clear of the keeper 2'1. Then the spring I! reacts, causing the hammer peen I!) to come down smartly on the saw tooth that is above the inclined surface 5 of the anvil A and, of course, the set is put into the saw tooth. When the hammercarrying end of the lever I5 moves downwardly,

the outer end of the lever [5 moves upwardly, with the keeper 2'! in contact with the inner edge of the finger 26 of the part 22. The operator'releases the pedal 20 and the pedal 28, along with the operating member 22, is raised to the position of Fig. 4. At the same time, the upper part of the operating member 22 is drawn inwardly, by the spring 24, the inner edge of the finger 26 having contact with the upper part of the throwoif 28, and the parts being restored to the positions of Figs. 4 and 1, ready to give another blow to the tooth to be set, when the pedal 20 is operated again.

It is to be observed that the throw-off 28 can be moved lengthwise and be adjusted from right to left in Fig. 4, by slacking away the bolt 21 and then tightening it. Because the throw-off 28 can be adjusted as aforesaid, the vertical stroke of the operating member or pitman 22 can be regulated, considered relatively to the amount of time that elapses before the throw-01f 28 slides the shoulder 25 of the part 22 off the keeper or bolt 21. In this way, the hammer end of the lever l5 can be raised more or less, and the spring I! may be elongated more or less, before the shoulder 25 is set free from the keeper bolt v21. The force of the blow imparted to the saw tooth'by the hammer peen l 9 therefore may be regulated. Figure 6 shows the part 28 set for an earlier kick-off than in Fig. 5.

Having thus described my invention, what is claimed is:

1. In a device of the class described, a frame, an anvil on the frame, a lever fulcrumed intermediate its ends on the frame, a hammer carried by one end of the lever and cooperating with the anvil, a keeper on the opposite end of the lever, an operating member having a shoulder releasably engaged with the keeper, and a throw-off on the lever and coacting with the operating member to disengage the shoulder from the keeper when the lever is actuated by the operating member.

2. .In a device of the class described, a frame, an anvil on the frame, a lever fulcrumed intermediate its ends on the frame, a hammer carried by one end of the lever and cooperating with the anvil, a keeper on the opposite end of the lever, an operating member having a shoulder releasably engaged with the keeper, a throw-off cooperating with the operating member to disengage the shoulder from the keeper when the lever is actuated by the operating member, and means for mounting the throw-01f on the lever for adjustment with respect to the keeper.

3. In a device of the class described, a frame, an anvil on the frame, a lever fulcrumed intermediate its ends on the frame, a hammer carried by one end of thelever and cooperating with the anvil, a keeper on the opposite end of the lever, anoperating member having a shoulder releasably engaged with thekeeper, a throw-off on the lever and cooperating with the operating member to disengage the shoulder from the keeper when the operating member is moved in one direction and spring means for moving the operating memher in an opposite direction and for holding the shoulder releasably engaged with the keeper.

4. A device of the class described, constructed as set forth in claim 1, in combination with a radius arm mounted to swing for adjustment on the upper portion of the frame, a holder constituting means for retaining a saw in position to be operated upon by the hammer and the anvil, means for mounting the holder on the radius arm for adjustmentlongitudinally of the radius arm, saw supports located on opposite sides of the radius arm and on opposite sides of the anvil, and means for mounting the saw supports on the frame in such manner that the saw engaging parts of the supports may be adjusted toward and away from each other.

JAMES A. JOHNSON. 

